/*
 * Copyright (c) 2014 pkzd/1.0, 颜文泽(robin)
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     1 Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     2 Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include	<errno.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<fcntl.h>
#include	<unistd.h>
#include	<string.h>

int
main(int argc, char *argv[])
{
	int 	n, fd;
	char	buf[1024];

	if(argc < 2){
		fprintf(stderr, "Usage: creatboot boot\n");
		exit(1);
	}
	if((fd = open(argv[1], O_RDWR)) < 0){
		fprintf(stderr, "Error: cannot open file %s: %s\n", argv[1], strerror(errno));
		exit(1);
	}
	if((n = read(fd, buf, 1024)) > 510){
		fprintf(stderr, "Error: %s is too large: %d(max 510)\n", argv[1], n);
		exit(1);
	}
	memset(buf + n, 0, 510 - n); 
	buf[510] = 0x55;
	buf[511] = 0xaa;
	lseek(fd, 0, SEEK_SET);
	write(fd, buf, 512);
	return 0;
}
